Donald Trump Jr. will meet behind closed doors with Senate Intelligence Committee investigators on Wednesday morning as part of their investigation into Russian meddling in the 2016 election, according to sources familiar with the plan.

Trump Jr.’s appearance before the committee has been highly anticipated. President Donald Trump's oldest son has emerged as a key figure as investigators seek to untangle how Russian government operatives sought to infiltrate Trump’s inner circle during the 2016 presidential campaign.

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Of particular interest is Trump Jr.’s attendance at a June 2016 meeting at Trump Tower, along with a Kremlin-connected lawyer and a former Russian intelligence officer. According to emails released by Trump Jr. on Twitter earlier this year, he took that meeting after being promised damaging information on his father’s then-political rival, Hillary Clinton.

That June 2016 meeting — also attended by former Trump campaign chair Paul Manafort and Trump’s son-in-law, Jared Kushner — was presented to Trump Jr. as “part of Russia and its government’s support for Mr. Trump.”

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Special counsel Robert Mueller, who is also investigating Russian meddling in the 2016 election, is also reportedly probing the Trump Tower meeting. Trump Jr. and Kushner have downplayed the meeting's significance, calling it a waste of time.

Kushner was interviewed by the Senate Intelligence panel over the summer. Trump Jr. was interviewed by the House Intelligence Committee earlier this month.

Trump Jr. is one of the last high-profile White House-connected individuals the Senate Intelligence Committee has not yet interviewed. Sen. Richard Burr (R-N.C.), the panel’s chairman, has said he hoped to conclude initial interviews by the end of 2017.